Flooding of September 30th and October 1st, 2010
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Flooding of September 30th and October 1st, 2010

A deep plume of moisture along the East Coast of the United States developed on Thursday, the 30th of September. The moisture was associated with the remnants of Tropical Storm Nicole. This moisture was being drawn northward by a deep upper-level low pressure area over the eastern United States. The combined system produced a widespread heavy rainfall all along the East Coast, including Central and Eastern Pennsylvania.

Flooding ensued on Friday (the 30th) after a narrow band of intense, tropical rainfall moved into Lancaster and Lebanon. See the radar images at the bottom of the page to see the start of the heavy rain, and the intense rainband of Friday morning (the 30th).

A widespread 2 to 4 inch rainfall occurred over the region, with a maximum of 4 to 7 inches along and just to the east of the main-stem Susquehanna River. See rainfall reports (map and text formats) below.

Most of Central Pennsylvania experienced widespread flooding on the smaller creeks and streams. Most of the flooded streams and creeks went back in their banks during Friday night.

Only a few river forecast points hit their flood stages, with minor flooding occurring on the Conestoga River at Lancaster, and on the Swatara Creek at both Harper Tavern and Hershey. See hydrographs of the stages at those 3 locations below.

Visible Satellite showing feed of moisture from the tropics into PA
Visible Satellite showing feed of moisture from the tropics into PA
  Map of Spotter and Public Rainfall Reports across Central and Eastern PA
Map of Spotter and Public Rainfall Reports across Central and Eastern PA
Map of NWS Co-Operative Observation totals over 2 days
Map of NWS Co-Operative Observation totals over 2 days

Text listing of Central PA preliminary rainfall reports:
PUBLIC INFORMATION STATEMENT

SPOTTER REPORTS

NATIONAL WEATHER SERVICE STATE COLLEGE PA
1235 PM EDT FRI OCT 01 2010

THE FOLLOWING ARE UNOFFICIAL STORM TOTAL RAINFALL ACCUMULATIONS
FOR AMOUNTS GREATER THAN 1 INCH OVER THE PAST 2 DAYS FROM
THE NATIONAL WEATHER SERVICE. THANKS TO PUBLIC AND COOP SPOTTERS
FOR YOUR REPORTS. 

********************STORM TOTAL RAINFALL********************
LOCATION          STORM TOTAL    TIME/DATE    COMMENTS
                     RAINFALL       OF
                     (INCHES)   MEASUREMENT

PENNSYLVANIA
...ADAMS COUNTY...
   CASHTOWN              5.75   900 AM  10/1   SPOTTER
   YORK SPRINGS          4.65   700 AM  10/1   COCORAHS
   BIGLERVILLE           4.61   700 AM  10/1   COOP
   GETTYSBURG            4.42   900 AM  10/1   SPOTTER
   HANOVER               4.22   700 AM  10/1   COOP
   ABBOTTSTOWN           4.04   700 AM  10/1   COCORAHS
...BEDFORD COUNTY...
   SAXTON                3.90   700 AM  10/1   COOP
   WOLFSBURG             3.88   700 AM  10/1   COOP
   RAINSBURG             3.52   600 AM  10/1   COCORAHS
   EVERETT               3.43   734 AM  10/1   COCORAHS
   EVERETT               3.29   700 AM  10/1   COOP
   RAINSBURG             2.95   700 AM  10/1   COCORAHS
   BUFFALO MILLS         2.90   700 AM  10/1   COOP
   RAINSBURG             2.48   700 AM  10/1   COCORAHS
...BLAIR COUNTY...
   DUNCANSVILLE          3.64   800 AM  10/1   COCORAHS
   NEWRY                 3.63   700 AM  10/1   COCORAHS
   TYRONE                3.41   700 AM  10/1   COOP
   WILLIAMSBURG          3.32   700 AM  10/1   COOP
   ALTOONA               3.17   700 AM  10/1   COOP
...CAMBRIA COUNTY...
   WESTMONT              2.74   700 AM  10/1   COCORAHS
...CAMERON COUNTY...
   SINNEMAHONING         3.93   700 AM  10/1   COOP
   SINNEMAHONING         3.59   700 AM  10/1   COOP
...CENTRE COUNTY...
   HOWARD 2SE            5.00   900 AM  10/1   SPOTTER
   PORT MATILDA          4.80   700 AM  10/1   COCORAHS
   STATE COLLEGE         4.25   640 AM  10/1   COCORAHS
   STATE COLLEGE         3.93   900 AM  10/1   NWS EMPLOYEE
   BELLEFONTE            3.90   800 AM  10/1   COCORAHS
   STATE COLLEGE         3.78   900 AM  10/1   NWS EMPLOYEE
   PHILIPSBURG           3.71   700 AM  10/1   COOP
   STATE COLLEGE         3.66   700 AM  10/1   COOP
   STORMSTOWN            3.59   900 AM  10/1   SPOTTER
   BOALSBURG             3.37   900 AM  10/1   SPOTTER
   LEMONT                3.36   900 AM  10/1   NWS EMPLOYEE

...CLEARFIELD COUNTY...
   GRAMPIAN              3.11   700 AM  10/1   COOP
...CLINTON COUNTY...
   LOCK HAVEN            4.60   700 AM  10/1   COOP
   RENOVO                3.79   700 AM  10/1   COOP
...COLUMBIA COUNTY...
   BENTON                7.20   700 AM  10/1   COCORAHS
   BENTON                6.86   700 AM  10/1   COOP
   CATAWISSA 3E          6.20   900 AM  10/1   SPOTTER
   CATAWISSA 2SW         4.60   900 AM  10/1   SPOTTER
...CUMBERLAND COUNTY...
   PINE GROVE FURNACE    4.56   700 AM  10/1   COOP
   MECHANICSBURG         3.70   800 AM  10/1   COCORAHS
   SHIREMANSTOWN         3.60   900 AM  10/1   SPOTTER
   SHIPPENSBURG          1.12   700 AM  10/1   COOP
...DAUPHIN COUNTY...
   WICONISCO             5.75   900 AM  10/1   SPOTTER
   ELZABATHVILLE         4.20   700 AM  10/1   COOP
   PAXTONIA              3.93   700 AM  10/1   COCORAHS
   MIDDLETOWN            3.70   800 AM  10/1   COCORAHS
   HERSHEY               3.43   700 AM  10/1   COOP
   HARRISBURG            3.41   700 AM  10/1   COOP
   HARRISBURG            3.33   700 AM  10/1   COOP
   HARRISBURG            3.21   600 AM  10/1   COCORAHS
...ELK COUNTY...
   ST. MARYS             2.13   700 AM  10/1   COCORAHS
   RIDGWAY               1.41   700 AM  10/1   COOP
   GLEN HAZEL            1.36   700 AM  10/1   COOP
...FRANKLIN COUNTY...
   SOUTH MOUNTAIN        3.83   700 AM  10/1   COOP
   GREENCASTLE           3.34   715 AM  10/1   COCORAHS
   GREENCASTLE           3.18   700 AM  10/1   COCORAHS
...LANCASTER COUNTY...
   LITIZ                 8.00   900 AM  10/1   SPOTTER
   SAFE HARBOR           7.64   700 AM  10/1   COOP
   MILLERSVILLE          6.98   700 AM  10/1   COOP
   ADAMSTOWN             6.90   700 AM  10/1   COCORAHS
   NEW HOLLAND           6.40   700 AM  10/1   COOP
   HOLTWOOD              6.37   700 AM  10/1   COOP
   LANCASTER             5.80   700 AM  10/1   COCORAHS
   ELIZABETHTOWN         4.40   900 AM  10/1   SPOTTER
...LEBANON COUNTY...
   FREDERICKSBURG 2S     8.80   900 AM  10/1   SPOTTER
   LEBANON               7.05   900 AM  10/1   SPOTTER
   MEYERSTOWN 1N         5.50   900 AM  10/1   SPOTTER
   PALMYRA               4.38   700 AM  10/1   COCORAHS
...LYCOMING COUNTY...
   HUGHESVILLE           4.75   900 AM  10/1   SPOTTER
   WILLIAMSPORT          4.53   700 AM  10/1   COCORAHS
   WILLIAMSPORT          4.43   700 AM  10/1   COOP
   MUNCY                 4.25   900 AM  10/1   SPOTTER
...MCKEAN COUNTY...
   KANE                  1.18   700 AM  10/1   COOP
...MONTOUR COUNTY...
   DANVILLE              3.04   700 AM  10/1   COOP
...NORTHUMBERLAND COUNTY...
   SUNBURY               4.37   700 AM  10/1   COOP
   SUNBURY 8E            3.64   900 AM  10/1   SPOTTER
...POTTER COUNTY...
   COUDERSPORT           3.80   700 AM  10/1   COOP
   OSWAYO                2.77   700 AM  10/1   COOP
   ROULETTE              2.65   700 AM  10/1   COCORAHS
...SCHUYLKILL COUNTY...
   PINE GROVE            8.08   700 AM  10/1   COOP
   ORWIGSBURG            5.01   600 AM  10/1   COCORAHS
   POTTSVILLE            4.93   700 AM  10/1   COCORAHS
   MAHANOY CITY          4.60   700 AM  10/1   COOP
...SNYDER COUNTY...
   SELINSGROVE           3.88   700 AM  10/1   COOP
...SOMERSET COUNTY...
   GLENCOE               3.27   700 AM  10/1   COOP
   SOMERSET              2.76   700 AM  10/1   COOP
   MEYERSDALE            2.66   700 AM  10/1   COOP
   LAUGHLINTOWN          2.47   700 AM  10/1   COOP
...SULLIVAN COUNTY...
   LAPORTE               4.16   700 AM  10/1   COOP
...TIOGA COUNTY...
   COVINGTON             4.90   700 AM  10/1   COOP
   WELLSBORO             3.82   700 AM  10/1   COOP
   WESTFIELD             3.60   700 AM  10/1   COCORAHS
   SABINSVILLE           3.46   700 AM  10/1   COOP
   TIOGA                 3.24   700 AM  10/1   COOP
...UNION COUNTY...
   MIFFLINBURG           5.37   700 AM  10/1   COCORAHS
   NEW COLUMBIA 5W       5.00   900 AM  10/1   SPOTTER
   LEWISBURG             3.64   700 AM  10/1   COOP
...YORK COUNTY...
   FAWN GROVE            8.30   900 AM  10/1   SPOTTER
   RED LION              4.05   900 AM  10/1   SPOTTER
   YORK HAVEN            3.74   700 AM  10/1   COOP
   VALLEY GREEN          3.67   600 AM  10/1   COCORAHS
   DOVER                 3.31   825 AM  10/1   COCORAHS
   NEW SALEM             3.16   500 AM  10/1   COCORAHS
$$
  image of Harper Tavern Stage in Feet
Harper Tavern Swatara Creek Stage/Hydrograph in Feet
image of Hershey Stage in Feet
Hershey Swatara Creek Stage/Hydrograph in Feet
image of Lancaster Stage in Feet
Lancaster Conestoga River Stage/Hydrograph in Feet

  Radar composite from 05zSep29th with surface observations overlaid
Radar composite from 05zSep29th with surface observations overlaid
Radar composite from 09zSep29th with surface observations overlaid
Radar composite from 09zSep29th with surface observations overlaid
Radar composite from 12zSep29th with surface observations overlaid
Radar composite from 12zSep29th with surface observations overlaid
KCCX Radar from 14zSep29th with surface observations and LAPS Precipitable Water values (inches) overlaid
KCCX Radar from 14zSep29th with surface observations and LAPS Precipitable Water values (inches) overlaid
This was during the first of the torrential downpours that hit Lancaster, Lebanon, and Schuylkill Counties.


 
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Page Last Modified: 04 October 2010 20:36:06 UTC
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